Looks less nice, but doesn't extend past end of column.
JBT4SCTGD7T424GUKOOULZVZIQSGDACPP25N62TCJ2VV5AVECS6QC
LA63KIU2TQ4ISN3VG3OJKKB6NEKU33RF7MC6XJRJMXEGCBBM4E2QC
YKRUNSPXQMYUZM2HC2BWRL3OLVF5X3Y3XASG7JCT4TW4VUHZD6ZAC
GQBUV2XOMEPMTXMPCBQWGGIUXGQDX77VTGPFIG6YT7G64ASOYHXQC
UHCBQAEPO46E4DOYJV7YDGJVZ62SH2OHZI4FVBNSGXXMX5JZAFFQC
love.graphics.rectangle('fill', Palette_cursor.x-5, Palette_cursor.y, App.screen.width, Line_height)
love.graphics.rectangle('fill', Palette_cursor.x-5, Palette_cursor.y, width+10, Line_height)